🌐 Fix Japanese translation of `docs/ja/docs/tutorial/body.md` (#3062)
🌐 Fix Japanese translation of `docs/ja/docs/tutorial/body.md` (#3062)

Co-authored-by: Sebastián Ramírez <668e2a3febf6a4b75056e840735926407962bc4e@gmail.com>
tiangolo/fastapi,tiangolo/fastapi,tiangolo/fastapi